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I use these in all my small tanks with aquarium plants in them and they give them great growth. With small tanks that have incadecent fixtures (ones where you have to screw the light in) this is the way to go. It's cheap, produces bright, clear light that let's plants thrive. Make sure the light you pick up is either rated "daylight" or has at least 6700k lumen is the color temperature. 10000k works well too but may give you a little more algae growth in tanks smaller than 10g.